Cyanogen-free plating method of zinc alloy die casting

A die-casting and zinc alloy technology, applied in the field of electrochemical surface science and engineering, can solve problems such as weak bonding force of the coating, friction and corrosion of the coating, and unsatisfactory anode dissolution, and achieve the effect of optimizing the electroplating process

Active Publication Date: 2011-05-11
广州市二轻研究所股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Zinc alloy cyanide-free electroplating is very difficult, especially copper plating, which often cannot meet the requirements of bonding force
(4) According to some literature reports, it needs to be charged into the tank during single metal plating, which brings inconvenience to the operation
[0004] In addition, cy

Method used

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  • Cyanogen-free plating method of zinc alloy die casting
  • Cyanogen-free plating method of zinc alloy die casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 Shown, a kind of zinc alloy die-casting part cyanide-free electroplating method comprises the steps:

[0033] (1) Waxing removal of zinc alloy die-casting blanks: Soak zinc alloy die-casting blanks in BH-20 wax remover solution of Guangzhou Second Light Industry Science and Technology Research Institute at 80°C and a concentration of 30ml / L for 12 minutes to remove zinc Wax on the surface of alloy die casting blanks to obtain zinc alloy die castings after wax removal.

[0034] (2) Water washing: wash the zinc alloy die-casting part after wax removal in step (1) three times at 20° C. to remove the residual wax remover solution on the surface.

[0035] (3) Chemical degreasing: the zinc alloy die-casting part cleaned in step (2), soaked in the degreasing agent solution of 40 ℃ for 12min, remove the grease on the surface of the zinc alloy die-casting part, and obtain the zinc alloy die-casting part after degreasing pieces; the concentration of trisodium phos...

Embodiment 2

[0043] Such as figure 1 Shown, a kind of zinc alloy die-casting part cyanide-free electroplating method comprises the steps:

[0044] (1) Wax removal of zinc alloy die-casting blanks: Soak the zinc alloy die-casting blanks in BH-20 wax remover solution of Guangzhou Second Light Industry Science and Technology Research Institute at 75°C and a concentration of 50ml / L for 20min to remove zinc Wax on the surface of alloy die casting blanks to obtain zinc alloy die castings after wax removal.

[0045] (2) Water washing: wash the zinc alloy die-casting part after wax removal in step (1) three times at 35° C. to remove the residual wax remover solution on the surface.

[0046] (3) Chemical degreasing: The zinc alloy die-casting parts cleaned in step (2) are immersed in a degreaser solution at 35°C for 20 minutes to remove the grease on the surface of the zinc alloy die-casting parts to obtain the zinc alloy die-casting parts after degreasing pieces; the concentration of trisodium p...

Embodiment 3

[0054] Such as figure 1 Shown, a kind of zinc alloy die-casting part cyanide-free electroplating method comprises the steps:

[0055] (1) Wax removal of zinc alloy die-casting blanks: Soak zinc alloy die-casting blanks in BH-20 wax remover solution at 85°C and a concentration of 40ml / L Guangzhou Second Light Industry Science and Technology Institute for 8 minutes to remove zinc alloy Wax on the surface of the die-casting blank to obtain a zinc alloy die-casting after wax removal.

[0056] (2) Water washing: wash the zinc alloy die-casting part after wax removal in step (1) three times at 30° C. to remove residual wax remover solution on the surface.

[0057] (3) Chemical degreasing: the zinc alloy die-casting part cleaned in step (2), soaked in a degreaser solution at 55°C for 8 minutes, removes the grease on the surface of the zinc alloy die-casting part, and obtains the zinc alloy die-casting part after degreasing pieces; the concentration of trisodium phosphate in the deg...

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Abstract

The invention discloses a cyanogen-free plating method of a zinc alloy die casting. The method is a plating method in which cyanogen-free copper-zinc alloy, copper-stannum alloy or ormolu is subjected to barrel plating or rack plating in a cyanogen-free copper-zinc alloy solution, copper-stannum alloy solution or ormolu solution as grounding layers so as to provide a pre-plating layer with good bonding force for subsequent plating or chemical plating. The method comprises the following steps: (1) carrying out ultrasonic wax removal or tumbling wax removal on a zinc alloy die casting blank; (2) washing; (3) chemically removing oil; (4) washing; (5) activating with 0.5% sulfuric acid; (6) washing; (7) carrying out barrel plating or rack plating on the alloys in the cyanogen-free copper-zinc alloy solution, copper-stannum alloy solution or ormolu solution; (8) washing; and (9) carrying out the subsequent plating or chemical plating. By using the method provided by the invention, cyanogen-free barrel plating or rack plating alloy is carried out on the zinc alloy die casting so that the obtained plating layer is semi-bright and has good bonding force.

Description

technical field [0001] The invention belongs to the field of electrochemical surface science and engineering, and in particular relates to a cyanide-free electroplating method for zinc alloy die castings. Background technique [0002] Cyanide copper plating has long been used as a base copper plating process for zinc alloy die castings, but cyanide is highly toxic and poses a serious threat to operators and the environment, making cyanide copper plating contrary to clean production. Therefore, cyanide-free electroplating is the future direction of development. Cyanide-free alkaline copper plating is the product of the national clean production development requirements, which largely eliminates the hazards of cyanide copper plating to operators and the environment. A lot of hard work has been done, and great progress has been made. [0003] However, compared with other substrates, the electroplating process of zinc alloy die castings is complicated, especially the cyanide-f...

Claims

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Application Information

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IPC IPC(8): C25D5/34C25D3/56C25D5/04
Inventor 赵国鹏徐金来胡耀红王华
Owner 广州市二轻研究所股份有限公司
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